This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 13 |
| 3 | 48 |
| 4 | 176 |
| 5 | 2736 |
| 6 | 10928 |
| 7 | 174768 |
| 8 | 699056 |
| 9 | 11184816 |
| 10 | 727960800 |
| 11 | 2863311536 |
| 12 | 183355069408 |
| 13 | 2967356682528 |
| 14 | 11728124029616 |
| 15 | 188313058624992 |
| 16 | 12121838249371488 |
| 17 | 768906329487027264 |
| 18 | 3074457345618258608 |
| 19 | 196765296972010592800 |
| 20 | 3148244377723715041632 |